|Publication number||US20080230581 A1|
|Application number||US 11/434,713|
|Publication date||Sep 25, 2008|
|Filing date||May 16, 2006|
|Priority date||May 16, 2006|
|Also published as||CA2588663A1, CA2588663C, DE602007003893D1, EP1857058A1, EP1857058B1, US8540132|
|Publication number||11434713, 434713, US 2008/0230581 A1, US 2008/230581 A1, US 20080230581 A1, US 20080230581A1, US 2008230581 A1, US 2008230581A1, US-A1-20080230581, US-A1-2008230581, US2008/0230581A1, US2008/230581A1, US20080230581 A1, US20080230581A1, US2008230581 A1, US2008230581A1|
|Inventors||Stanislaw Marczyk, Keith L. Milliman|
|Original Assignee||Stanislaw Marczyk, Milliman Keith L|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (13), Classifications (7), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
1. Technical Field
The present disclosure relates generally to an anvil assembly which is suitable for use with a circular anastomosis stapler. More specifically, the present disclosure relates to an anvil assembly having a tiltable head which is suitable for use with a circular anastomosis stapler.
2. Background of Related Art
Circular anastomosis staplers which include an anvil assembly having a tiltable anvil head are known in the art. One such circular anastomosis stapler is disclosed in U.S. patent application Ser. No. 10/968,722 (“'722 application”) which is incorporated herein by reference in its entirety. In some known circular anastomosis staplers, a backup plate located within the anvil assembly is positioned to prevent tilting of the anvil head of the anvil assembly prior to firing of the stapler. Upon firing of the stapler, a knife blade of the stapler engages and moves the backup plate to a position which allows the anvil head to tilt upon retraction of the knife blade. If the backup plate sticks to the knife blade upon retraction of the knife blade, the backup plate may return to its position preventing tilting of the anvil head. Thus, the anvil head will not tilt.
In order to prevent the backup member from sticking to the knife blade, the '722 application discloses a retainer clip which engages the backup plate upon retraction of the knife blade. Although, the retainer clip is effective, other devices for preventing retraction of the backup plate are desired.
A tilt anvil assembly is disclosed which includes a center rod and an anvil head assembly including a housing, a post, an anvil plate having staple deforming pockets, and a backup member. The head assembly is pivotally secured to the center rod and pivotal in relation to the center rod between a non-tilted position and a tilted position. The backup member is movable about the post from a first position in which a portion of the backup member is positioned to prevent movement of the head assembly from the non-tilted position to the tilted position to a second position in which the backup member is positioned to accommodate movement of the head assembly in relation to the center rod from the non-tilted position to the tilted position. The anvil assembly further includes a pivotal latch member positioned in the head assembly to prevent movement of the backup member from the second position to the first position.
In one embodiment, the head assembly is pivotally secured to the center rod about a pivot member and the pivotal latch member is pivotally mounted about the pivot member. The pivotal latch member is spring loaded and positioned to engage an inner periphery of the backup member when the backup member is in the non-tilted position. When the backup member is moved to its second position, the latch member is urged by the spring to a position engaging and in front of the backup member to urge the head assembly to the tilted position and prevent movement of the backup member from the second position to the first position.
In one embodiment, the anvil assembly further includes a retainer member positioned in the head assembly to prevent movement of the backup member from the first position to the second position until a predetermined force has been applied to the backup member. The predetermined force is between about ten pounds and about ninety pounds. The retainer member can include a deformable member which is positioned in the head assembly between the housing and the backup member. In one embodiment, the housing and the post define an annular recess and the retainer member is positioned in the annular recess. The retainer member can include an annular body which is positioned about the post and a plurality of deformable tabs extending therefrom. The backup member is positioned to abut the retainer member such that upon movement of the backup member from its first position to its second position, the deformable tabs are deformed.
In one embodiment, the backup member includes a cutting ring and a backup plate. The cutting ring can be secured to a proximal face of the backup plate. The backup plate can include at least one finger positioned to engage a distal surface of the center rod when the backup member is in its first position to prevent pivotal movement of the head assembly in relation to the center rod. The cutting ring can be formed from a softer material than the backup plate. In one embodiment, the cutting ring is formed from polyethylene and the backup plate is formed from a metal.
Various embodiments of the presently disclosed tilt anvil assembly are disclosed herein with reference to the drawings wherein:
Embodiments of the presently disclosed tilt anvil assembly 10 will now be described in detail with reference to the drawings in which like reference numerals designate identical or corresponding elements in each of the several views.
A cutting ring cover 23 is secured to a outwardly facing or proximal surface 40 of cutting ring 22 using, for example, an adhesive. In one embodiment, cutting ring cover 23 is formed from a material or materials, which have a hardness greater than that of the cutting ring, e.g., mylar. In one embodiment, cutting ring cover 23 includes two layers of mylar (not shown) which are joined together using an adhesive and a polypropylene coating. Alternately, cutting ring 22 need not have a cover. Cutting ring 22 and backup plate 20 are slidably mounted about post 16. Backup plate 20 includes a pair of inwardly extending fingers 38 which will be described in further detail below.
Retainer member 27 is positioned in inner annular recess 36 between backup plate 20 and a back wall 18 a (
Anvil center rod assembly 14 includes a center rod 52, a plunger 54 and plunger spring 56. A first end of center rod 52 has a pair of arms 59 which define a cavity 59 a (
Referring to FIGS. 3 and 6-9, cam latch member 26 includes a body 26 a having a throughbore 26 b. Throughbore 26 b is dimensioned to receive pivot member 62 such that cam latch member 26 is pivotally mounted within transverse slot 72 (
Plunger 54 is slidably positioned in a bore 64 (
It will be understood that various modifications may be made to the embodiments disclosed herein. For example, the cutting ring and backup plate can be unitarily or integrally formed. Further, the anvil assembly need not have cutting ring cover. Therefore, the above description should not be construed as limiting, but merely as exemplifications of preferred embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the claims appended hereto.
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US8109426 *||Jul 30, 2009||Feb 7, 2012||Tyco Healthcare Group Lp||Surgical tilt anvil assembly|
|US8328063 *||Jan 4, 2012||Dec 11, 2012||Covidien Lp||Surgical tilt anvil assembly|
|US8496157||Feb 18, 2011||Jul 30, 2013||Covidien Lp||Tilting anvil for annular surgical stapler|
|US8616428 *||Nov 12, 2012||Dec 31, 2013||Covidien Lp||Surgical tilt anvil assembly|
|US20120104073 *||Jan 4, 2012||May 3, 2012||Milliman Keith L||Surgical tilt anvil assembly|
|US20120325888 *||Jul 30, 2010||Dec 27, 2012||B.J.Zh.F. Panther Medical Equipment Co., Ltd.||Tiltable and repositionable anvil assembly for stapler and stapler comprising the same|
|US20130068817 *||Nov 12, 2012||Mar 21, 2013||Covidien Lp||Surgical tilt anvil assembly|
|EP2153781A2||Aug 11, 2009||Feb 17, 2010||Tyco Healthcare Group, LP||Surgical tilt anvil assembly|
|EP2286740A1||Aug 18, 2010||Feb 23, 2011||Tyco Healthcare Group LP||Surgical stapler|
|EP2308392A1||Aug 11, 2009||Apr 13, 2011||Tyco Healthcare Group LP||Surgical tilt anvil assembly|
|EP2415407A1||Aug 11, 2009||Feb 8, 2012||Tyco Healthcare Group, LP||Surgical tilt anvil assembly|
|EP2583631A1||Sep 26, 2012||Apr 24, 2013||Covidien LP||Tilt top anvil with torsion spring|
|EP2586384A1||Sep 26, 2012||May 1, 2013||Covidien LP||EEA tilt top anvil with ratchet/locking mechanism|
|Cooperative Classification||A61B2017/00544, A61B17/115, A61B17/1114, A61B2017/00473|
|Jul 20, 2006||AS||Assignment|
Owner name: TYCO HEALTHCARE GROUP LP, CONNECTICUT
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MARCZYK, STANISLAW;MILLIMAN, KEITH L.;REEL/FRAME:018071/0766;SIGNING DATES FROM 20060705 TO 20060706
Owner name: TYCO HEALTHCARE GROUP LP, CONNECTICUT
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MARCZYK, STANISLAW;MILLIMAN, KEITH L.;SIGNING DATES FROM20060705 TO 20060706;REEL/FRAME:018071/0766
|Oct 2, 2012||AS||Assignment|
Owner name: COVIDIEN LP, MASSACHUSETTS
Free format text: CHANGE OF NAME;ASSIGNOR:TYCO HEALTHCARE GROUP LP;REEL/FRAME:029065/0448
Effective date: 20120928